Apparatus for producing wood-plastic composites
阅读：680发布：2022-11-01
专利汇可以提供Apparatus for producing wood-plastic composites专利检索，专利查询，专利分析的服务。并且A system for converting wood to a wood-plastic composite in which the steps of pressure impregnation of the wood with a monomer and polymerization of the monomer within the wood by either heat or irradiation is accomplished in a single container. The system includes an apparatus by which a thin walled container is able to withstand the internal pressure of monomer impregnation and a method and apparatus for handling the container in the polymerization processes. The system further includes an irradiation tank equipped with an irradiation absorbing fluid recirculation system for bacteria control and an inert gas system for displacing the irradiation absorbing fluid from between the submerged containers and the irradiation source. The irradiation source includes a plurality of line sources variable in spacing and in the intensity of irradiation. Means are provided to overcome the spatial variation in radiation produced by the discrete line sources by a time oscillation of the array of line sources with respect to the container.，下面是Apparatus for producing wood-plastic composites专利的具体信息内容。
1. Apparatus for converting wood to a wood-plastic composite comprising: a. a canister having a pair of substantially planar walls which are insufficiently thick to withstand internal pressures substantially in excess of atmospheric pressure and an openable side for insertion of the wood to be converted; b. means for closing the operable sides and forming a sealed canister; c. means for evacuating the air from within said canister; d. means for filling said canister with an inert gas; e. an impregnating station including means for evacuating the inert gas from within said canister, means for impregnating wood inside said canister with a monomer under a pressure substantially in excess of atmospheric pressure; and means for externally supporting said planar canister walls against separation when superatmospheric pressures are applied to the interior of said canister; f. means for removing the excess monomer from within said canister; and g. means for polymerizing the monomer within the wood while the wood remains in said canister.
2. The canister of claim 1 further including means for spacing the wood from interior surfaces of the canister walls to prevent condensation which forms on said interior surfaces from contacting said wood.
3. The apparatus of claim 1, wherein said polymerizing means comprises a source of gamma radiation, said parallel canister walls are sufficiently thin to pass radiation for effecting polymerization of said monomer, and said impregnating station includes means for supplying a monomer under a pressure of at least 40 pounds per square inch.
4. The apparatus of claim 3 wherein said means for polymerizing the monomer includes a source of gamma radiation sufficiently submerged within a radiation absorbing fluid to provide biological protection, and means for submerging said canister into said fluid to be in radiation receiving proximity with respect to said source.
5. The apparatus of claim 3 wherein said impregnating station comprises; a. a frame; b. a first support member mounted to said frame and adapted to abut one of said canister walls; c. a second support member mounted to said frame and adapted to abut the other of said canister walls; and d. means for moving said first and second support members toward and away from each other to permit insertion and removal of said canister at said impregnating station.
6. The apparatus of claim 5 wherein said impregnating station comprises means for supporting the canister between said supports including a plurality of spaced parallel rollers mounted to said frame and having axes disposed in the direction of movement of said support members.
7. The apparatus of claim 5 wherein said first support member is rigidly secured to said frame and said support member is mounted for movement relative to said first support member by means including spaced parallel rails secured to said frame, a trolley movable alOng each of said rails, and means for suspending said second support member from said trolley.
8. The apparatus of claim 7 wherein said means for moving said movable support includes a plurality of rods threaded through nuts fixed relative to said frame, a keeper on said rods adapted to engage said second support member, and means for rotating said rods to urge said second support member toward said first support member.
9. The apparatus of claim 8 wherein the impregnating station further includes means for supporting the canister between said supports comprising a plurality of spaced-parallel rollers mounted to said frame and having axes disposed in the direction of movement of said second support member whereby the canisters are inserted and moved along said rollers and secured in position by movement of said second support member against one of said canister walls.
10. The apparatus of claim 1 wherein said canister comprises; rigid, upstanding side and end walls of a strength sufficient to withstand the internal pressure of impregnating the wood with the monomer; wherein said parallel canister walls comprise a bottom wall coextensive with said upstanding side and end walls and secure thereto and a top wall coextensive with said upstanding side and end walls, said top and bottom walls being substantially parallel and sufficiently thin to permit polymerization of the monomers by exposure to radiation, and all of said top wall being removable to provide access to the interior of the canister for loading and unloading; and wherein said canister further comprises a seal disposed between said top wall and said side and end walls; and means for releasably securing said top wall to said upstanding side and end walls.
11. The apparatus of claim 10 wherein said impregnating station further includes a. a frame; b. fixed and movable support members attached to said frame for supporting the top and bottom walls of the canister; c. means for supporting the canister between said fixed and movable support members; d. means for moving said movable support member toward said fixed support member to support the thin walls of the canister; e. a supply source of a monomer to be impregnated in said wood; f. a source of an inert gas; g. pumping means for selectively creating a positive or negative pressure within the canister; and h. means for selectively connecting said sources of monomer and inert gas to said pumping means.
12. The apparatus of claim 11 wherein one of said end walls is provided with an externally operated valve for draining the interior of the canister and wherein the other of said end walls is provided with attachment means for moving the canister.
13. The apparatus of claim 12 wherein the other one of said end walls has externally operated valve located adjacent each of said sidewalls for introducing and removing the inert gas and monomer from said canister and including a lining of insulating material positioned adjacent the interior walls of the canister so as to prevent the contact of the wood to be converted with said interior wall surfaces.
14. The canister of claim 13 wherein said means for releasably securing said top wall to said upstanding side and end walls includes a plurality of threaded bolts secured through apertures in the cooperating surfaces of said side and end walls externally of said seal.
15. The apparatus of claim 1 wherein the means for polymerizing the monomer comprises: a. a tank having bottom and upstanding walls filled with radiation absorbing fluid; b. means for supporting a source of radiation within said radiation absorbing fluid; and c. means for lowering the canister containing wood to be converted into said fluid and into radiation receiving proximity of said source and for raising said canister after irradiation.
16. The apparatus of claim 15 further comprising means for removing part of the radiation absorbing fluid between the radiation source And the canister which includes means for releasing an inert gas into said fluid between the canister and said source at the lower end thereof.
17. The apparatus of claim 13 further comprising means for recirculating said inert gas which includes a. a plenum chamber for collecting said gas as it rises in said fluid from between the canister and said source; b. pump means for evacuating said plenum chamber; c. separating means for separating the fluid from the gas evacuated from said plenum chamber; d. means for storing the separated gas; and e. means for pumping said separated gas to the lower end of said source.
18. The apparatus of claim 15 further including means for rotating and for moving said canister which includes: a. a rail supported beneath the surface of said fluid; b. a trolley movable along said rail; c. means for moving said trolley along said rail; d. support means for rotatably supporting said canister from said trolley; and e. means for rotating said support means.
19. The irradiation pool of claim 18 wherein said means for rotating and moving said canister includes: a. a plurality of rails supported within said fluid in a spaced-parallel relationship; b. two trolleys mounted for movement along mutually exclusive portions of each of said rails; c. hydraulic means for moving said trolleys along said rails; d. means for supporting a canister from each of said trolleys, said means including a vertical shaft; and e. means for independently rotating the shaft of each of said support means.
20. The apparatus of claim 15 wherein said source is an elongated flat plaque that is movable across said tank by means including: a. a rail substantially traversing the width of said tank and supported beneath the surface of said fluid; b. a trolley mounted on said rail; c. means for supporting said plaque from said trolley; d. means for moving said trolley along said rail; and e. means for restraining said plaque against upward and downward movement during normal operation of said apparatus.
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